London 2012: 80% of Olympics tickets sold
More than 80% of all Olympics tickets - some seven million - have been sold, the BBC has learned.
Organiser Locog said a million were bought in the last month and several thousand were yet to be made available.
Meanwhile, to mark a month to go to the opening ceremony of the Games, a track by rock band Muse, called Survival, was announced as the official theme.
And London 2012 chairman Lord Coe watched as giant Olympic rings were lowered into place on Tower Bridge.
Locog said excluding football, 90% of all tickets had been sold but tickets remained for volleyball, boxing, weightlifting and basketball although they were mainly top prices in early competition rounds.
Some tens of thousands have yet to be made available from a remaining pool of contingency tickets, organisers said.
There had been a small trickle of returned tickets including a very small number of pairs of 100m finals seats which would be released on to the general website when cleared for resale.
Locog said it was "very close" to its revenue target of £600m, which includes VAT.
London 2012 - One extraordinary year
To mark one month to go to the Games, organisers outlined the spectator experience, saying that crowds would be treated to "pop up" gigs at venues from the likes of Rizzle Kicks and the Scissor Sisters.
Videos explaining the sporting events would also be shown between sessions, while during the action visitors to some of the venues can pay £10 for in-ear wireless commentary.
A tongue-in-cheek "goodbye" video featuring Olympians such as decathlete Daley Thompson and Amir Khan, musicians and actors such as Gary Barlow and Helen Mirren will be played as spectators leave the venues.
It contains advice, including "Mind the Gap" for Tube travellers from comic actor Simon Pegg, and is interspersed with the word goodbye written in many different languages.
London 2012 also issued a list of "top tips" which include a "strong suggestion" not to bring a bag to football matches and only one small soft-sided rucksack or handbag to other events.
Spectators were reminded that only 100ml of liquid can be brought into the Olympic Park and other venues.
"You can bring an empty plastic water bottle and fill it up at water points inside venues," the advice reads.
"There is a wide range of food available to buy, but if you need to bring your own food, it must fit inside your bag."
The Main Press Centre, which will host up to 6,000 press and photographic media during Games-time, has become the first venue to open for business on the Olympic Park.Light show
Earlier, Culture Secretary Jeremy Hunt and London Mayor Boris Johnson also witnessed the suspension of the giant Olympic rings under the high-level walkway of Tower Bridge.
The 82ft (25m) wide rings, which weigh three tonnes, cost £259,817 to produce and around £53,000 to install.
Lord Coe said: "The Olympic rings are an iconic symbol, inspiring athletes and uniting people around the world.
"To athletes they represent the culmination of thousands of hours of training and reaching the highest level in sport.
"With one month to go to the Olympic Games opening ceremony, these spectacular rings on one of London's most famous landmarks will excite and inspire residents and visitors in the capital."
A multi-coloured light show will bring the rings to life on Wednesday night.